I'm not sure if it's as simple as that, certainly OSX has been poorly neglected with 10.10 but generally their cloud services are rock solid (at least in Australia) where Microsofts alternatives suffer from weekly unexplained outages and poor performance on a global level. The number of Amazon instances that crash and fail to ever come back or new instances that start broken is also often dismissed it seems.
Rubbish. I just sold the kids' MacBooks and iPads because iCloud and Pages/Numbers is a piece of shit from a reliability perspective. Add to that the WiFi stopped working reliably with 10.10.
iMessage still suffers from massive consistency failures; due to the incoming messages not being chronologically ordered even small network glitches mean things get confusing fast. iCloud at least in part seems to run on Microsoft Azure, amusingly enough.
I'm not questioning your anecdata, but (to offer some of my own) I have never experienced this and none of the people I work with or socialise with have ever brought it up. I only hear people on the internet talking about it as if it's true of the service as a whole. It definitely isn't.
This concur with the #watchFiasco of apple, explicitly saying "you're pigeons, and we deliver"